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Email Systems: Understanding Mail Servers, Clients, and Commands - Prof. John Robert Arras, Study notes of Computer Science

University of MarylandComputer Science
Prof. John Robert Arras

This presentation covers the basics of email systems, including the use of email clients, mail servers, and various email protocols. Learn about smtp, pop, imap, and mime attachments, as well as common mail commands for reading, composing, and managing emails.

Typology: Study notes

Pre 2010

Uploaded on 02/13/2009

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Slide 1
1
Using email
• Messages sent from machine to machine
and stored for later reading.
• You will use a client to read email:
– Type mail or pine in UNIX to read email.
– Use programs like Outlook on Windows.
• Different mail servers use the same
protocols to communicate with each other.
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Slide 2
2
Mail Servers
• SMTP (Simple Mail Transfer Protocol) transfers
mail between servers.
• The mail server runs a program (daemon) that
listens for clients connecting so people can read or
write mail.
• On UNIX this program is called sendmail.
• A single protocol helps to ensure that different
servers can communicate with each other.
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Slide 3
3
Mail Clients
• POP -- Post Office Protocol
– Downloads all mail at once.
– IMAP -- Interactive Mail Access Protocol, adds
features to POP
• Some Clients
– ELM
– PINE (PINE Is Not Elm)
– Outlook
– Eudora
– Netscape Mailer
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Download Email Systems: Understanding Mail Servers, Clients, and Commands - Prof. John Robert Arras and more Study notes Computer Science in PDF only on Docsity!

1

Using email

  • Messages sent from machine to machine

and stored for later reading.

  • You will use a client to read email:
    • Type mail or pine in UNIX to read email.
    • Use programs like Outlook on Windows.
  • Different mail servers use the same

protocols to communicate with each other.

___________________________________

___________________________________

___________________________________

___________________________________

___________________________________

___________________________________

Slide 2

2

Mail Servers

  • SMTP (Simple Mail Transfer Protocol) transfers mail between servers.
  • The mail server runs a program (daemon) that listens for clients connecting so people can read or write mail.
  • On UNIX this program is called sendmail.
  • A single protocol helps to ensure that different servers can communicate with each other.

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___________________________________

___________________________________

___________________________________

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___________________________________

Slide 3

3

Mail Clients

  • POP -- Post Office Protocol
    • Downloads all mail at once.
    • IMAP -- Interactive Mail Access Protocol, adds features to POP
  • Some Clients
    • ELM
    • PINE (PINE Is Not Elm)
    • Outlook
    • Eudora
    • Netscape Mailer

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4

Parts of an Email

  • Body -- This is the actual message.
  • Header -- information at the top of the message.
    • From: or Received: who sent the mail.
    • To: Where the mail goes.
    • Cc: Other people who will receive this mail.
      • Bcc: Blind carbon copy -- a list of people who get a copy of the message but don’t get listed.
    • Subject: What the mail is about.
    • Date: When the mail was sent.

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Slide 5

5

The mail command

  • You can use the mail command in several ways:
    • mail -- by itself, it opens your messages and lets you read them
    • mail person@address -- lets you compose a message to someone at a certain address.
    • mail message to someone at an address, with a certain - s (subject) person@address -- lets you send a subject.
    • mail - s (subject) person@address < text_file -- lets you send a message to someone with text_file as the body of the email.

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Slide 6

6

Using mail

  • When you are writing the mail message

body, use ^D or . to end

editing and send the message.

  • If cc: shows up, this is a list of other

addresses you can enter if you wish to send

a message to other people.

  • ^C will kill a mail message you are typing.

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10

Header Editing

  • While editing a message you may use…
  • ~h -- lets you edit the header (to, subject,

cc, bcc)

  • These may also work:
    • ~s -- edit the subject.
    • ~t -- edit the to list.
    • ~c -- edit the cc (carbon copy) list.
    • ~b -- edit the bcc (blind carbon copy) list.

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Slide 11

11

Other Features

  • alias -- combine addresses
  • .forward file – send mailto another address.
    • Forward to self to get a copy on the sending machine.
  • Listservs -- automatic mailing lists.

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Slide 12

12

PINE

  • A menu-driven client
  • Uses pico as an editor
  • Allows MIME attachments
  • Main Menu
    • C - Compose to write a message
    • I or L - View messages
    • Q - Quit

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13

MIME Attachments

  • Multipurpose Internet Mail Extension
  • Add pictures, files to emails
  • Can be dangerous with executables.
  • Pine uses MIME instead of plain inclusion.
  • Filename on attachment line when writing.

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